基金Canadian Institute of Health Research CCI-92216:MOP62823国家自然科学基金资助国际合作交流项目(30811120439)Acknowledgments Melissa Andrew is supported by a doctoral award from the Canadian Institutes of Health Research and by a Killam Scholarship. Kenneth Rockwood is supported by the Dalhousie Medical Research Foundation as the Kathryn Allen Weldon Professor of Alzheimer Research. The Canada China Collaboration of Aging and Longevity is sponsored by both the Canadian Institutes of Health Research and the National Natural Science Foundation of China.